Chemical Kinetics Class 12 Chemistry MCQs Pdf
1. What will be the fraction of molecules having energy equal to or greater than activation energy, Ea?
(a) K
(b) A
(c) Ae-Ea/Rt
(d) e-Ea/Rt
Answer
Answer: d
2. 
What type of reaction is this?
(a) Second order
(b) Unimolecular
(c) Pseudo-unimolecular
(d) Third order
Answer
Answer: c
3. Which among the following is a false statement?
(a) Rate of zero order reaction is independent of initial concentration of reactant.
(b) Half life of a third order reaction is inversely proportional to square of initial concentration of the reactant.
(c) Molecularity of a reaction may be zero or fraction.
(d) For a first order reaction, \(t_{1 / 2}=\frac{0.693}{\mathrm{K}}\)
Answer
Answer: c
4. Which of the following statements about the catalyst is true?
(a) A catalyst accelerates the rate of reaction by bringing down the activation energy.
(b) A catalyst does not participate in reaction mechanism.
(c) A catalyst makes the reaction feasible by making ∆G more negative.
(d) A catalyst makes equilibrium constant more favourable for forward reaction.
Answer
Answer: a
5. An endothermic reaction with high activation energy for the forward reaction is given by the diagram.
Answer
Answer: c
6. For the reaction N2 + 3H2 → 2NH3 if \(\frac{\Delta\left[\mathrm{NH}_{3}\right]}{\Delta t}\) = 2 × 10-4 mol L-1s-1, the value of \(\frac{-\Delta\left[\mathrm{H}_{2}\right]}{\Delta t}\) would be
(a) 1 × 10-4 mol L-1s-1
(b) 3 × 10-4 mol L-1s-1
(c) 4 × 10-4 mol L-1s-1
(d) 6 × 10-4 mol L-1s-1
Answer
Answer: b
7. The rate of a certain hypothetical reaction
A + B + C → products
is given by r = \(\frac{-d[\mathbf{A}]}{d t} \mathbf{K}[\mathbf{A}]^{1 / 2}[\mathbf{B}]^{1 / 3}[\mathbf{C}]^{1 / 4}\). The order of the reaction is
(a) 13/11
(b) 13/14
(c) 12/13
(d) 13/12
Answer
Answer: d
8. In the formation of S02 by contact process;
2SO2 + O2 → 2SO3, the rate of reaction was measured as \(\frac{-d\left[\mathrm{O}_{2}\right]}{d t}\) = 2.5 × 10-4 mol L-1s-1. at
The rate of formation of of S03 will be
(a) -5.0 × 10-4 mol L-1s-1
(b) -1.25 × 10-4 mol L-1s-1
(c) 3.75 × 10-4 mol L-1s-1
(d) 5.00 × 10-4 mol L-1s-1
Answer
Answer: d
9. For a chemical reaction A→B, it is found that the rate of reaction doubles when the concentration of A is increased four times. The order of reaction is
(a) Two
(b) One
(c) Half
(d) Zero
Answer
Answer: c
10. The half life of the first order reaction having rate constant K = 1.7 x 10-5s-1 is
(a) 12.1 h
(b) 9.7 h
(c) 11.3 h
(d) 1.8 h
Answer
Answer: c
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